Harsh Metalloys, a well-respected name in Mumbai, India, stands out as a top manufacturer and supplier of Stainless Steel 440B Nuts. These nuts are celebrated for their impressive strength, hardness, and decent resistance to corrosion. Grade 440B is a high-carbon martensitic stainless steel that boasts better hardenability than its lower-carbon counterparts. Our 440B nuts come in a variety of sizes, threads, and specifications, catering to the diverse fastening requirements of precision-focused industries. Designed for applications that demand durability and wear resistance, these nuts find their place in automotive, tooling, aerospace, mechanical equipment, and other high-performance industrial settings.
When it comes to composition and mechanical properties, Stainless Steel 440B Nuts generally consist of 16–18% Chromium and 0.75–0.95% Carbon, along with trace amounts of Manganese, Silicon, and Molybdenum. With the right heat treatment, 440B can achieve a Rockwell hardness of 55 HRC or even higher. It delivers a tensile strength that surpasses 725 MPa and maintains good mechanical stability. Although it’s not as corrosion-resistant as austenitic stainless steels, it performs admirably in mildly corrosive and dry conditions. These nuts excel in wear resistance, making them perfect for applications that require reliable fastening performance under mechanical stress and high temperatures.
C | Si | Mn | P | S | N | Cr | Cu | Mo | Ni | Ti | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
0.75 – 0.95 | – | – | – | – | – | 16.00 – 18.00 | – | 0.90 – 1.30 | – | – | 0.07 – 0.12 |
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell (HR C) | Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed* | 758 | 448 | 14 | 269HB max | – |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 260 | 1960 | 1830 | 4 | 57 | 9 |
| 316 | 1860 | 1740 | 4 | 56 | 9 |
| 371 | 1790 | 1660 | 4 | 56 | 9 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.74 g/cm3 | 0.280 lb/in³ |
| Melting point | 1482°C | 2700°F |
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A corrosion-resistant product, Stainless Steel 440B nuts are available in sizes from M6 to M64. Known for their high strength and hardness, they are ideal for heavy-duty applications in industrial machinery and automotive components.
A corrosion-resistant product, Stainless Steel 440B coupling nuts, used to join two male threads, come in sizes from M6 to M36. They provide exceptional strength and durability, making them suitable for high-stress and heavy-duty applications.
A corrosion-resistant product, Stainless Steel 440B nylon insert nuts, or lock nuts, are available in sizes from M3 to M36. The nylon insert prevents loosening under vibration, offering secure fastening in high-strength and demanding environments.
A corrosion-resistant product, Stainless Steel 440B flange hex nuts feature an integrated flange and come in sizes from M5 to M20. They provide enhanced load distribution and stability, suitable for high-stress and high-temperature applications.
A corrosion-resistant product, Stainless Steel 440B heavy hex nuts are available in sizes from M10 to M48. Their increased thickness and strength make them ideal for heavy-duty applications and high-stress environments requiring robust and secure fastening.
A corrosion-resistant product, Stainless Steel 440B square nuts offer a larger contact surface and come in sizes from M6 to M30. They are ideal for high-strength applications requiring reliable performance in heavy clamping and industrial settings.
Harsh Metalloys ensures high-quality materials with a string of tests for excellence. Stainless Steel 440B Nut goes through proper checks such as hardness testing, spectrochemical analysis, PMI testing, tensile testing, micro and macro structural tests, pitting resistance, and IGC testing. We assure high performance through these strict checks. Supporting our commitment to quality, we provide documentation, such as commercial invoices, packing lists, labels, Certificates of Origin, and Third-Party Inspection Certificates, for customer satisfaction on pricing, delivery, and reliability of the products.
Stainless Steel 440B Nuts are a go-to choice for applications that require exceptional strength, hardness, and wear resistance. You’ll often find them in tool assemblies, machinery parts, pumps, automotive systems, and even aerospace structures. Thanks to their impressive hardness after heat treatment, they’re perfect for fasteners that face friction, impact, and stress. Plus, 440B nuts are great for medical tools, industrial valves, and mechanical joints where secure fastening and precise dimensions are crucial. Their reliable performance in dry and mildly corrosive environments makes them a top pick for high-precision, high-load situations.
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